Plain files
Real `.md` files from your disk or a public HTTPS URL, ready for any repo, folder, or agent workflow.
Free native Markdown editor
Aviv Editor
A calm native Markdown editor with writing and preview in one clean surface.
Built natively for macOS and Windows, Aviv avoids a browser shell and works directly with real Markdown files. On macOS, Aviv 1.1.5 reveals the exact URL behind a Live Document, restores natural title-bar dragging, and keeps search compact and collision-free.
Native desktop app
Native desktop builds
No browser shell
No license key
MIT open source
NativeSwift + AppKit and WinUI 3 builds.
CalmOne surface, no preview pane.
PlainReal `.md` files on disk.
Markdown without the split-screen tax.
Aviv keeps one editable surface: readable like a document, honest like plain text, and quiet enough for daily work.
Live surface
Rendered Markdown stays inline while the source remains editable.
Quiet chrome
Minimal controls, no dashboard, no mode switcher, no clutter.
Native structure
Native desktop builds instead of a browser shell around a web app.
Focused codebase
Focused native code keeps the architecture direct for everyday notes and specs without bundling a browser shell.
Open source
MIT licensed, public on GitHub, free without a paid unlock.
Write in one place.
The document stays readable while you edit, so writing does not become a preview-management task.
Keep the structure intact.
Markdown remains plain, portable, and agent-readable underneath the calm visual layer.
Use local images naturally.
Attachments render inline while Aviv preserves the original Markdown source path.
Search without covering your tools.
The macOS search field stays in a fixed, compact toolbar group. When it opens, nonessential controls step aside, so search never overlaps another control or shifts the document.
Move between results quickly.
Tiny previous and next buttons sit beside the field. Press Return or Command-G for the next result and Shift-Return or Shift-Command-G for the previous one.
See matches across the document.
Sections containing results are marked yellow in the document outline, making clusters of matches easy to spot in long documents.
Edit the Markdown you see.
Click a heading, link, emphasis, code span, list, task, quote, or table to reveal its real source markers. Click away and Aviv restores the calm rendered view without moving the caret or page.
See the exact live source.
Click the compact Live Document indicator to reveal the complete selectable backing URL and copy it in one step. The transient popover never shifts the toolbar or document.
Open a public Markdown URL.
Use File → Open from URL… on macOS. Aviv keeps the source identity and polls with ETags on a one-second default interval.
Stay exactly where you were.
Clean incoming edits refresh in place while Aviv preserves selection, caret, scroll position, visible text anchor, and document width.
Keep local edits safe.
If both sides change, Aviv keeps your buffer intact and shows a clear conflict state. Nothing is overwritten until you choose.
Save only through a real write path.
Command-S uses an authenticated conditional bridge when the source advertises one. Ordinary public URLs remain honestly read-only.
Notice the update, not a reset.
A compact native live indicator, shimmer, edge pulse, changed-line marker, and restrained toast signal incoming work without entering document layout or crowding the macOS window controls.
The language of agents
Markdown is the calm format agents already understand.
Prompts, specs, decisions, and agent instructions need a format that reads well for people and parses cleanly for machines. Markdown is that common ground.
Agent prompts and system instructions
Implementation plans and acceptance criteria
Evidence-first reports and decision logs
Reusable business knowledge in Git
Portable documentation for humans and models
Native architecture, calm interface.
Aviv uses Swift and AppKit on macOS and WinUI 3 on Windows so the editor can stay native without carrying a browser shell. Resource use varies by platform and document.
Native windows
macOS document behavior with tabs and multiple windows.
Reliable document insight
The outline and viewport stay aligned across headings, lists, tables, and trailing newlines.
Native print
Print and page setup use the macOS system flow.
Native runtime
No browser shell. Measure resource use on the target operating system and representative documents.
A4 print mode
Blog and A4 formats keep writing calm while printing uses paper-aware margins.
Default app prompt
Native startup prompts can help make Aviv the app that opens Markdown files.
Download
Free, native, no key.
Aviv is a free native download for macOS and Windows. No lite mode, no license key, no subscription prompt, no hidden unlock, and no heavy browser-shell footprint.